Ornery (which some people change to onnery) dates to 1816 at least. Henri came over with Lafayette, and has been with us ever since. Turner Classic Movies shows a lot of his stuff.

Pedantically, a fellow named U. Brown in his journal, 1816, wrote, "The Land is old, completely worn out, the farming extremely ornary in general."
Perhaps some ancestor of Artbrooks decided Brown meant ordinary.

The word appears in its current meaning in 1861 when the writer wrote, "Good company betters the orneriest sort of weather."
Both the quotations from the OED.